Malicious PDF — malware analysis report

Static analysis result for SHA-256 871f82f6d7a206ee…

MALICIOUS

PDF

36.1 KB Created: 2018-06-11 08:07:10 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: a4660cc201f31dcad5789a6355048a3f SHA-1: 48ac8df5f9473bfd9a061429fbdbc3d1da681d20 SHA-256: 871f82f6d7a206ee444936f4f420d9bf622874f0e3df838dc6b1b801e6f24d8e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by an ML classifier and exhibits characteristics of SEO poisoning, specifically a fake download lure. The document contains embedded URLs pointing to a domain associated with SEO spam, suggesting an attempt to trick users into downloading potentially harmful files. The presence of a visual download button further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9136

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • PDF carries a PHP-gateway SEO-spam PDF link farm medium PDF_SEO_PHP_GATEWAY_LINK_FARM
    PDF contains four or more clickable links whose target is a `.php` gateway with a multi-word search-PHRASE document slug embedded after it (e.g. 'index.php?.../binary+options+trading+nz.pdf' or 'pdf.php/cialis-dosage-side-effects.pdf'). Legitimate PHP-served documents use a filename or numeric id, not a search-query phrase, so this is the generated SEO link-farm shape — pharma / binary-options / 'free download' spam that ranks for queries and routes users into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://uncpbisdegree.com/download3.php?q=the-psychological-dieter-it-not-all-about-the-calories.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-psychological-dieter-it-not-all-about-the-calories.pdfIn PDF document text
    • https://peterattiamd.com/do-calories-matter/In PDF document text
    • https://chriskresser.com/are-you-an-under-eater-8-signs-youre-not-eating-enough/In PDF document text
    • http://www.psychology4a.com/eating-behaviour.htmlIn PDF document text
    • http://www.fatnutritionist.com/index.php/why-diets-dont-work/In PDF document text
    • http://www.coachcalorie.com/working-out-but-gaining-weight/In PDF document text
    • http://www.bodyfatguide.com/LooseSkin.htmIn PDF document text
    • http://www.ontheregimen.com/2013/10/15/how-to-count-your-macros-a-comprehensive-guide/In PDF document text
    • http://sciencedrivennutrition.com/truth-high-fat-diets/In PDF document text
    • https://www.myoleanfitness.com/intermittent-fasting-what-to-eat-drink/In PDF document text
    • http://dietweightlossfasti.com/garcinia.cambogia.not.losing.weight=mg14902/In PDF document text
    • http://dietweightlossfasti.com/does.premium.garcinia.really.work/pure-garcinia-cambogia-extract-100-all-natural=sg3089/In PDF document text
    • https://www.thediabetescouncil.com/why-do-most-diets-fail/In PDF document text
    • https://markmaunder.com/2012/07/22/the-basic-ketogenic-diet/In PDF document text
    • http://www.drbriffa.com/2014/01/30/my-take-on-the-horizon-documentary-sugar-v-fat/In PDF document text
    • https://chriskresser.com/how-to-lose-weight-without-trying-on-a-paleo-diet/In PDF document text
    • http://perfecthealthdiet.com/reader-results/In PDF document text
    • http://www.steviacafe.net/dangers-of-splendaIn PDF document text
    • http://paleoforwomen.com/how-extremity-can-make-even-the-best-diet-fail/In PDF document text
    • http://riverside-resort.net/1/the-ancient-chinese-world-the-world-in-ancient-times.pdfIn PDF document text
    • http://riverside-resort.net/1/spers-sec-test-paper.pdfIn PDF document text
    • http://riverside-resort.net/1/the-singing-mermaid.pdfIn PDF document text
    • http://riverside-resort.net/1/surveying-principles-and-applications-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/singapore-state-of-the-art.pdfIn PDF document text
    • http://riverside-resort.net/1/the-freud-reader.pdfIn PDF document text
    • http://riverside-resort.net/1/the-beloved-forces-of-the-guru-1st-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/solubility-rules-chem-worksheet-15-1-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/tempest-1-julie-cross.pdfIn PDF document text
    • http://riverside-resort.net/1/the-plant-alkaloids.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/Yo-yo_effectIn PDF document text
    • http://www.dailymail.co.uk/health/article-5121223/Mindfulness-meditation-helps-maintain-weight-loss.htmlIn PDF document text
    • https://www.nytimes.com/2012/01/01/magazine/tara-parker-pope-fat-trap.htmlIn PDF document text
    • https://www.fda.gov/ForConsumers/ConsumerUpdates/default.htmIn PDF document text
    • http://www.health.com/health/gallery/0,,20967696,00.htmlIn PDF document text
    • http://www.health.com/weight-lossIn PDF document text
    • http://www.health.com/weight-loss/resolution-rebootIn PDF document text
    • http://time.com/collection/guide-to-weight-loss/4793832/the-weight-loss-trap/In PDF document text
    • https://www.yogajournal.com/lifestyle/count-yoga-38-ways-yoga-keeps-fitIn PDF document text
    • https://www.nytimes.com/2011/08/21/magazine/do-you-suffer-from-decision-fatigue.htmlIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000514b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x514B 9944 bytes
SHA-256: 7ddd9a00f6d917d10e24328cd0b43b281c481c314a836aee51fca2df38d0b0b9
font_01_sfnt_off000070f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70F3 7408 bytes
SHA-256: 6717c52da0175c5f230b2a08421f0e517b5f0a66adf972c4c1afd371f7f85e82